Cam-cutting machine



July 2, 1929.

J. c. SHAW ET AL 1,719,813

CAM CUTTING MACHINE Original Filed Nov. 27, 1925 5 Sheets-Sheet 1 July 2, 1929. .1. c. SHAW ET AL.

CAM CUTTING MACHINE 5 Sheets-Sheet 2 Driginal Filed Nov. 27, 1925 July 2; 1929.

J. c. SHAW ET AL cm CUTTING MACHINE 5 Sheets-Sheet 3 Original Filed Nov, 27, 1925 .QRN

July 2, 1929.

c. SHAW ET AL CAM CUTTINGMACHINE Original Filed Nov. 27, 1925 weetsheet 4 July 2, 1929.

J- C. SHAW ET AL CAM CUTTING MACHINE 5 Sheets-Sheet Original Filed Nov. 27, 1925 adaptedto-control the horizontal and vertical Patented July 2, 1929.

UNITED STATES PATENT OFFICE.

JOHN C. SHAW AND ROBERT D. SHAW, OF BROOKLYN, NEW YORK, ASSIGNORS 'IC KELLER MECHANICAL ENGINEERING CORPORATION, OF BROOKLYN, NEW YORK,

A CORPORATION OF NEW YORK.

CAM-CUTTING MAdii'INEs-" h Application filed November 27', 1925, Serial No. 71,826. Renewed June 5, 1928.

Our improvement relates more particularly to a means for cutting cams on an electrical tracer controlled machine tool, on the order of a milling machine or die sinking machine, equipped or operating somewhat after the manner of the machine shown and described in the patent to John C. Shaw, #1,50t,4:54, August 26, 1924, or in the application of John 0. Shaw, Ser. No. 696,827, filed March 4/24.

In machines of the type shown in the Shaw patent, three directions of feed motion are provided including horizontal, vertical and transverse and, ordinarily, the electric tracer is adapted for controlling only the in and out or toward and from feed of the transverse slide, although all of the feed motions are preferably controlled through magneticclutch drlven feed screws.

When a contouringtracer is used, as shown in said Shaw application, the tracer is feeds, that is, to control motion in two directions at right angles to each other.

' In the present instance, however,'the toward and from feed, under the control of the electric tracer, is applied to the horizontal slide or reciprocating table and, in cooperation therewith, a spindle carrying the cam blank is adapted to be rotated, in either direction, by means of magnetic clutches, electric'ally interconnected in such a manner as .to be controlledthrough the action of the electric tracer. Operatively connected with the spindle carrying the cam blank, there is [provided atemplate carrying member provided with a profile edge or contour, corre- .sponding to the desired cam, said template being adapted to cooperate with the electric l tracer tov control the movements of the ma- 4 0 chine in such a manner as to produce the desired cam by the action of a cutter on the cam blank, as the tracer follows the edge of the-template. The main object of our improvement, there fore, is to provide a simple method of out: tingcams, either of the face or edge type or drum cams bynse of thefsame apparatus, when so desired." y

This object maybe carried out in a single purpose machine for cutting either face, edge or drum type of cams, but obviously, it will *bennderstood. that the mechanical features F "of'our improvementumaybe. adapted for or applied to standard types of milling or die sinking machines hereinbefore referred to. as

A further object is to provide for cutting the desired cams from a template or pattern, preferably geared to the spindle carrying the cam blank and adapted for straight line move 'in a straight line, which is preferably ac- 'curately-divided into spaces corresponding to the 360 of a circular cam.

In cutting a cam in this manner, a further object of our improvement is to provide for operating the magnetic clutches for the to ward and from screw feed and for rotating the cam blank spindle on the main line high potential current, while controlling the energization of the respectivemagnetic clutches by means of relays in a low potential circuit controlled by'tracer contacts on the tracer head. In this connection, also it will be understood that for mechanical reasons, it

is not desirable to permit more than the 360 of movement of the template and, therefore, limit switches are provided for breaking the magnetic clutch circuits controlling the rota tion of the cam blank spindle at each extreme of movement of the template or pattern.

One advantageous feature of our improve ment for laying out and generating cams is that special template plates of standard length may be provided, the lates being preferably graduated or divide into spaces corresponding to 360, lengthwise, and transversely thereof, into spaces representing 7 linear measurements. Both sets of gradua" tions may be formed by ruled lines, the sets being at right angles to each other in the manner of ordinary profile paper, thereby providing'a simple and ready means for laying out a development of the desired cam. When these plates are properlylaid out, the profile of the cam development may he read ily cut out, so that when the plate is mounted in our improved machine, either a face plate or drum cam can be cut therefrom, as may be required. In this manner, the laying out and cutting of cams becomes a simple matter, for iteliminates the trouble ordinarily experienced in laying out cams in the ordinary manner, and. furthermore, it simplifies the reproduction of such cams if a plurality thereof should be desired.

In carrying out our improvement, we have preferred to illustrate a single purpose machine, which is shown in the accompanying drawings. Fig. 1 shows an end elevation of our cam cutting machine, with a portion thereof in vertical section; Fig. 2 is a top lan viewof the machine as shown in Fig. 1; *ig. 3 1s a broken away detail showing a front elevation of the template and cam blank during the operation of cutting a cam Fig. 4 is a side elevation of the parts shown in Fig. 3; Fig. 5 represents an angular lay out of the cam being cut in Fig. 3, and represented by the contour or development on the template, shown in Fig. 3; Fig. 6 is a top plan View of the cam cutting machine of Figs. 1 and 2. in which the cam blank spindle and associated parts are shown as rotated 90 for the purpose of cutting a drum cam; and Fig. 7 illustrates the tracer diagrammatically, in connection with a wiringdiagram of the electrical connections, whereby the control of the machine is efi'ected.

The form of cam cutting machine which we have illustrated comprises a base member 1. which may be cast integral with a pier 2 extending upward atone side of thebase member and adapted to support the power driven cutter. For this purpose, the upper end of pier 2 is preferably provided with a transverse bore at 3, in which there is mounted a bearing thimble 4, carrying a spindle 5, in the outer end of which the cutter 6 may be secured. The bearing thimble 4 may preferably be provided with rack teeth at 7, meshing with a pinion 8 provided with a hand wheel in the usual manner, for moving the bearing thimble 4 and hence, adjusting the position of the cutter 6 in an axial direction. The spindle 5'carries a gear 9, which meshes with a pinion 10. secured to gear 11, which in turn, is driven by pinion 12 carried by gear 13, meshin with a pinion 14, mounted on the end of the s aft 15 of an electric motor 16, which is preferably mounted on the top of the pier 2, as shown in Fig. 1. It will be noted that the intermediate gearing 9 to 14 is adapted to reduce the s eed of the cutter relative to the speed of the motor and, obviously the gears may be interchangeable so asto provide for any desired reduction or variation in the speed of the cutter that may be required.

Mounted on the upper end of the pier 2, is a bracket 17, adapted to support an electric tracer 18, in a vertical plane, passing through the axis of the spindle 5 and cutter 6, substantially as indicated in Figs. 2 and 3 of the drawings. The electric tracer is adapted to cooperate witha template or pattern as hereinafter described, while the cutter is adapted to operate upon the cam blank to produce the desired cam as the tracer follows the edge of the template.

The upper portion of the base 1 is formed with slide ways 19, upon which there is mounted a longitudinal slide 20, which is adapted to be reciprocated or be fed longitudinally by means of a feed screw 21, which is mounted in bearings 22 on the bed 1, substantially as shown in Fig. 2. The usual hand wheel 23 may be provided at one end of the feed screw 21 for manual adjustment of the screw and preferably the opposite end is operatively connected with a pair of magnetic clutches 24. through the medium of the clutch armature 25, which is keyed to the shaft end of the screw 22. substantially as shown and described in the Shaw patent and application, hereinbefore referred to. The magnetic clutches 24 are adapted to be driven'from the motor 26 by engaging the bevel pinion 27', thereby providing for toward and from feed of the carriage or slide 20, according to which of the clutches 24 is energized.

The slide 20 preferably carries a horizontal table 28. mounted on transverse ways 29, a

for sliding movement toward and from the pier 2, as indicated in Figs. 1 and 2. and a feed screw 30 is provided for adjusting the position of the table 28 relative to the tracer and cutter. The usual hand wheel 31 is provided for rotating the screw 30. Mounted upon the transverse slide or table 28 is a bracket support. 32. carrying and rotatably supporting a spindle 33. the axis of which is adapted to lie in the same horizontal plane with the axis of the spindle 5 and cutter 6 and, as shown in Figs. 1 and 2, the spindle 33 lies nearly end to end parallel with the spindle 5. The outer or right end of the spindle 33, as seen in Figs. 1 and 2, preferably carries a worm gear 34. with which a worm 35 meshes, the latter being rotatably mounted in a bearing block 36, preferably cast integral with the upper end of the bracket support 32, as indicated in Fig. 1. The shaft of worm 35 preferably carries at one end a worm gear 37 meshing with another worm 38, carried on the end of a shaft 39, rotatably mounted in a bearing block 40, also formed, in the present instance, as an integral part of the bearing support 36. The opposite end oft-he shaft 39 carries a gear 41, which meshes with a gear 42 mounted on the end of a shaft 43, operatively connected to a pair of magnetic clutches 44 through the clutch armature 45 substantially as shown and described in the Shaw patent and application previously referred to. The magnetic clutches 44 are adapted to be driven by a pinion 46, secured to the drivenergized determines the amount of rotation of the spindle 33 and this, as hereinafter described, is adapted to be controlled by the electric tracer 18.

The end ofthe spindle 33, facing the cutter 6, as shownin Fig. 1, is adapted to support the cam blank 49, which is secured thereto and adapted to be rotated by the magnetic clutches 44 through the intermediate worm gearing just described. It will be understood that by means of the transverse slide or table 28, upon which the supporting bracket 32 is mounted, the position of the cam blank 49, relative to the cutter 6, can be adjusted so that the latter may cut the proposed cam, either on the face of the blank or around the edge thereof, as more particularly described hereinafter.

In order to completely control the cut ting of the desired cam by automatic control of the'feeds through the tracer 18, a rack is preferably mounted to slide vertically in slide ways 51, mounted on the bracket 48, as indicated in Fig. 1. The rack 50 meshes with a gear 52 mounted on the spindle 33, directly back of the cam blank 49, as shown in Fig. 1. The upper end of the rack 50 is preferably provided with laterally extending supporting arms 53, for supporting a template 54, as indicated in F ig. 3, the arms 53 being preferably secured to the ends of a plate or bar 55, secured by screws 56 to the upper part of the rack bar 50.

The profile edge 57 of the template 54 is adapted to be cut to correspond with a development of the proposed cam and this edge is adapted to cooperate with the tracer 18 to control the relative toward and from movement between the cutter 6 and the cam blank 49, to thereby produce or cut the desired cam as the cam blank is rotated by means-of the magnetic clutches 44. Obviously, in cutting cams according to our method, the longitudinal movement of the rack 50 should correspond to 360 of circular movement of the cam blank 49. Hence, to prevent excessive movement in either direction, adog or stud 58 is preferably attached to the rack bar 50, and is adapted to engage upper and lower limit switches 59 and 60, for breaking the circuits of the respective magnetic clutches 44, at either extreme of movement of the rack bar 50, to thereby stop rotative movement of the cam blank 49.

Standard plates may preferably be supplied from which the templates 54 may be cut. Such lates are preferably graduated longitudinally or marked oil to represent 360 of movement, corresponding to a complete rotation of the'pinion 52 and spindle 33, and hence, to a complete rotation of the cam blank 49. These template plates may preferably be supplied in standard lengths and widths graduated longitudinally by cross lines, corresponding to degrees, and transversely by lines corresponding to linear measurements in inches or in the metric sys tem, foraccurately laying out the distance of the points,rises and dwells, from the base line or center of the proposed circular cam. After the development of the proposed cam hasbeen laid out on the ruled plate, just described, the profile edge 57 thereof may be cut to represent a straight line development of the cam, this edge being adapted for cooperation with the tracer 18, as indicated in Fig. 3.

The templates 54 are preferably adapted to be removably secured to the bracket arms 53, by suitable screws 61, thereby providing a ready means for substituting one template for another, when it is desired to cut a different form of cam. In Fig. 3, the position of the respective parts represents the operation of cutting an edge cam which when finished, will correspond substantially to the cam represented in Fig. 5; the latter being laid out in the usual manner. From a com parison of the ordinary method of laying out a cam, as shown in Fig. 5, with the simple method of laying out a straight line development thereof, as represented by the profile edge 57, in Fig. 3, it will be readily understood that our improvement provides anexceedingly simple means, whereby the ordinary machinist in the shop can lay out the desired cam, without any particular trouble, thus eliminating all of the bother and elaborate calculations that are ordinarily required for accurately laying out a cam, as indicated in Fig. 5.

The supporting bracket 32, carrying the cam blank spindle 33, is adapted to be secured to the transverse slide ing table 28, by a swivel bolt 62, and two lag bolts 63, as indicated in Figs. land 2, so that the spindle lies transveresly of the reciprocating feed movement imparted thereto by the feed screw 21, under the control of the or reciprocat magnetic clutches 24. -When the spindle support is secured to the reciprocating table 28 in this manner, that is, as shown in Figs. 1 and 2, the machine is adapted for cutting face or edge cams on face plate type of cam blanks 49, which are adapted for cooperation with the cutter 6, while the tracer 18 is in cooperation with the edge 57 of the tem- I plate 54, as indicated in Fig. 3 of the drawings.

It is obviously desirable, however, to utilize the same machine for cutting drum cams :when so desired, and for this purpose the supporting bracket 32 is mounted on the re- 'f-cipIOGiltiIlg table 28 so that it may be swung around the swivel bolt 62, when the lag bolts 63 are removed, and may be again secured to the table top 28, with the spindle 33 at right angles to t e spindle 5, or parallel to the I feed screw 21, as indicated in Fig. 6. For securing the spindle supporting bracket 32 in "position forv cutting drum cams, the table 28 L l screw-holes 64, as shown in Fig. 2, adapted to receivethe lag bolts 63, and the support 32 in the position is provided with suitably located threaded thereby secure shown in Fig.

- 6. 'The left screw hole 64 is preferably lo- :cated in an ear 65 projecting from the side 7 of the table28, as shownin Figs. 1 and 2. a

that the cutter should be of a diameter corresponding to the diameter of the cam roller.

In cut-ting drum cams, it is obvious that the same toward and from movement of the reciprocating table 28, 'under the action of the magnetic clutches 24, driving the feed screw 21,- is required and may be controlled by the tracer 18, following the profile development of the cam on the template 54.

For cutting. a cam, however the template Q 54-.-should'be-disposed in a verticalplane at right angles-to the axisof the tracer (the;

same as with an edge cam) and in order to do this, after the spindle supporting bracket32 has been moved around 90, to.the posi-r77. p

.Theci'rcuits of the relay magnets 76 and tion shown in; Fig. 6, an angle bar 66 is pref erably substituted for the bar and secured to theupper part of therackbar 59, by the;- 7 screws '56, said angle bar 66 being provided ,with. corresponding arms 53, for supporting template so as to to the tracer.

the template, substantially as shown in Fig.

6. In usin the same cam blank rotating mechanism or'cutting drum cams, as well as for face and edge cams, it .will be understood that the same electricafcontrol mechanisms are brought into play under the control of ,the electric tracer, and the; only-change reg quired in the machine is shifting the cam; blank spindle 33, 90,"and then shifting'the. maintain it at right angles.

The control of shown diagrammatically and partially in secthe electric tracer shown and described in the 7 Shaw application, hereinbefore referred to. It will be seen that the tracer 18 is carried on the end of a universally movable pivoted bar 67, adapted to wobble on a ball and socket joint at 68, supported in a tubular casing 69, which is adapted to be supported inthe bracket 17, as indicated in Figs'l and 2. The inner end of the tracer bar 67 is seated in a cone socket in the lower end of the contact lever 69, which is pivoted at 70 in the head of the tracer, through which it is grounded to the machine, as indicated at 71. A spring 72 is adapted to keep the lower end of the contact lever seated on the end of the tracer bar 67, and move the upper end of the contact lever so as to normally close contact 73 with contact 74, which, by means of the lead I,

75, is connected to the magnet 76 of a double throw relay, the armature contact bar 77 of which is adapted to close a high potential circuit to the magnetic clutches 24, for operating the toward and from feed of the table 28. as hereinbefore described.

The upper end of the contact carrying lever 69 also carries a contact 78, adapted to coopcrate with a contact 79, carried in an auxiliary contact lever 80, pivoted at 81, in the tracer head, as indicated in 'Fig. 7. The contacts 78 and 79 are normally open for, as previously stated, normally the contacts 73 and 74 are closed. A spring 82 is provided for holding 4 the auxiliary contact bar 80, with contacts 83 and 84 closed, these last mentioned contacts being adapted to close the main line high potential, or volt circuit, through the leads 85' and 86 connected to the respective contacts as shown in Fig. 7. The contact 79'is connected b lead 87 with the magnet 88 of the double t row relay and is adapted to operate on the same contact carrying armature 88, marked respectively'L'and R in Fig. 7, are completed through leads 89 and 90, connected respectivel to relay magnets 91 and 92, the" circuits 0 seentl i at'for normal operation of'the tracer, the contacts-controlled thereby are on a low the latter magnets being completed through the leadv93 to the source potential circuit, such th'at the contacts will i not be finjured,-while relays are provided for control of the high potential circuits, utilized for energizing the magnetic .clutch cs 24:

our improved cam cutting!" machine by means of the tracer, will be more' ",iclearly understood by reference to the wiring.; fdiagram shown in Fig. 7. In connection with the wiring diagram, the electric tracer is The I 'l l'0ivolt high source is 3 indicated by'the leads at 96 and 97, the former 83 andalso by lead 98with the pivot of the double throw relay armature 77, so as to complete the circuit through lead 99 to'the'magnetic clutch 24;, .(marked L) for controlling .being connected by'thelea'd 85. t6 the contact till , previously pointed out; the conta feed of the-table 28;;and,-hence, dflthercam blank carried onthe'spindle mane left, or toward the cuttenaszt'iewedfin Fig.

The circuit-from the let't (Llmagneticclatch lead 101 with arcontact adapted tobe closed by the doable throw -armatNreTTT on therelay magnet 88 is energized. "Tle circnit through ,theright-feed magnet te clutch R) is completed through 1 the hleatl 1100, san'zeaas are closed, thus energizing the-relay magnet 7 6 and closing the mainline circnitthmnzgh the armature 7'7 and leadfltl toithezleftifeed magnetic clniclrill; but obviously, if the pressure beconnes too great on the tracer L18,tth-e contacts '73--1"71- will he separatek'l::andithecircuit broken. Further excessirclpressnrewon the tracer will close the contacts' 'ltl 211M379 to energize the relay magnetBS, Wliic ln' n-mving the armatureTT ovcrito closethe circuit through the lead 101,.to the magneticclutch 24, marked ll, willenergizc the lattervto thereby move the reciprocating:tableflQStoward the right, and, in so doing, Willmove 16011111 blank, as shown 1n Fig.2, awayfrom the cnt= LGI. I .The high potential mainline circnit (110 volts) )8 also ntihzed {orenergizingtheaanagnct1c clutches 44, for rotating the cam blank in one direction orthe otl-rer. ilThese clntches are indicated in the Wiring diagram (if "Fig. 7, one being marked clock and ltheeother countenclock to designate thedirectioni of rotation givento the can'rhlank mounted on the end of the spindle 3'3. JTlreinain line lead 97 is connected by shortleadsElllgahdl'lfldlwith the respective magnetic clutches iMyandthe circuit of the clockwise cluteh'isconnected by lead an with the contact of thelimit switch 59, and then by lead li5with a terrninalacontact 106, with which a doublethrow switch 107 is ada ted to cooperate the latter being connected y lead 108 Witha contactav at 109, cooperating with an armature contact that 110, adapted to beactuated by'th-e table stop relay magnet 92, asindicated;infFigJ'Y. The table stop relay 91;,also cooperates with ca contact armature illl which is connectdbyqa short lead 112With thearmatureillmthe high potential circuit being completed through armature contactl113 and I lead 86, pre\iious11y referred to. The le.a1d 86,=it .willbescemEiS connected with thecontact 84; onitheanxiliary lever 80 carried by the tracer head. Thusathe contacts 83 and "84 serve asansemergencywcnt out or safety device, inthatsexcessiveypressure on the tracerilB, after closing contacts 'mland '7 9 and reversing thezfeedi of thei table12S, -Mill break the circuit o'frthe clutches dzanllsstop the rotation of thecam blanksfif'thidhas nnt Y-stoppin :t complet on or 1 :a wsinglc rotation. The table stop relay magnets? :91 wa ez each operates a single Athrow contact armature and these ,arnnltaures ll-(l-ianid .111 are normally heldby springs 1171.0 close the respective contacts 1' already been: accomplished by the breakin of contacts at 1 109. or 1113. "The co-anter clocfi V: magnetic clutch44 has its: circuit: completed 2 throngh'lead 114" to the rotation or rack limit switch represented hycontact lever 160,:Whi0h, ithrongh the lead 115, is connected with "a terminal contact 116, @a dapted, like cont-act 106, to cooperate with theldouble throwswitch lOT-tOudBtQl'HllllBL the direction ofrotation of the cam. blank. lIt; is obvious that in cutting any, particular-cam, the direction of rotation 1.01% the canr blank: need not be changed during the wetting operation and, hence, after i the SWll'C'll 3107 has kbeen thrown i to "one contact or=the other: (10601 116 the switch will re- :main closed on that contact until; the cutting 1 operation is completed. The respective limit- .ing switches C59 and 60, however, will break :the operating-circuitat the extreme of movement,=, either up or ddwn, or the'rack bar 50, a-thns preventing "nry to the machine a and sho rotation of the cana blank at the 1'09 and 113, which the circuit? through the switch 107. p

Our improved scheme for laying out i and cutting cams and the operation of=ourimp roved a cam cutting machine will be under- .stoodffroan thezforegoing description, in eon 'nect'ion 'withithedrawingsand the Wiring diagrannibut it is desirable to describe briefly rth-e cutting of theitwo types of cams.

,For cuttingaznredge cam, substantially v as predetermined length and graduated longitu'dinally to correspond to 360 of circurnfer' ential: movement ofatheassociated spindle 33, :toiwhich it is gearedby the rack bar and pinionf 52. The-rises, :depressions and dwells .Ofillllfi .defsiredicarnware laid out in a straight line: development on the template plate, and theedge-r of the latter is out: to :rreprescnt the eprofile rojf the desired v,cam. The template ledge 57 'l'i-s mounted "to cooperate w th the tracer 11 8 [for @controlling :the reciprocatory ;movement 1 of the :table 28 and, hence, the 'towardvand-ffromiteed betwecn-1 the cam blank and? template on the one hand and: the cutter wand :the ;tracer :on the other.

.Asillnstratedihythe wiring diagram Fig.

loam Tblank are moved axially EindicatediiniFigs. 3am]. 5 cit-the drawings, E the cam blank A9 comprises a face plate or cam disc. mounted npon'the endof the spindle 133, Ni'hich should be located a transversely of 1 the reciprocating table 28, as illustrated 1n "Figs. land 2. The proposed cam is thenlaid ontonuatemplate plate h l, which, as A previlonely pointed out, is preferably of standard toward or from each other, corresponding.

identically with the angular. positions of the rises, depressions and dwells of the template. The magnetic clutches 44 will rotate the cam blank 49 and spindle 33 in either clock-wise or counter-clockwise direction, according to which way the switch 107 is thrown, and the rotation of the spindle 33 (and longitudinal movement of the template) is adapted to be.

controlled. through the table stop relays 91' 92, and their contact armatures 110 and 111. In case of excessive pressure on the tracer 18, however, the high potential circuit through the magnetic clutches 44 will be broken at the contacts 8384. As illustrated in Fig. 3, the

cam blank 49 is being rotated counter-clock wise and the cutter is'shownas nearly completinghthe cutting of an edge cam correspondlngjto that shown in Fig. 5; I vioii'sly pointed out,when the spindle 33 and cam blank 49 complete'a rotation, the dog 58,011 the rack bar 50' is adapted to engage the limit switch 60 and break the contact,

thereby opening thecircu'itof the leads 114 and 115 ,to the counter-clockwise magnetic clutch 44, as will be seen from Fig. 7, of the drawings. g g When it is desired to cut a face cam, the template is mounted in the same manner as shownin Fig. 3, and the same relation of the spindles .5 and 33, as shown in Figs. 1 and 2, is employed, the only difference being that in starting the cutting of the cam, the cutter which may be provided with an end mill, bores intothe face of'the cam blank the de-' sired depth before rotary motion of the cam blankand spindle 33 is started. The depth 'ofthemill into the face of the cam blank may be determined by rotation of the trans- ,versefeed screw 30. After the cutter has penetrated the face of the cam blank the desired depth, the cutting of the face cam is controlledby the tracer 18, following the edge 57 of the template 54, substantially as previously described for the edge cam shown in Fig.3.

When it is desired to cut a barrel cam, the

. supporting member 32, carrying the cam spindle 33, is rotated 90 to the position s own inFig. 6, and secured to the reciprocatin table 28, by the lag'screws 63. The barre cam blank 49 is then secured to the end of the spindle 33, substantially as shown plate may be cut'to correspond to the. development of the proposed cam. The template,

however, is mounted on the upper end of the rack bar 50, parallel with a vertical plane through the cam spindle 33, instead of at As preright angles thereto, theplane of the template, however, being at right angles to the tracer 18,..with which the edge thereof is adapted tocooperate.

The operation of cutting a drum cam after the machine ha been prepared as just described, and fitted with the desired template, is substantially the same as described for face or edge cams. That is, the toward and from movement of the reciprocating table 28, relative to the cutter, is controlled by the action of the profile edge of the template on the tracer 18, and the latter operating through the contacts 7374 and 7879, is adapted to control the feed of the table 28 through the double throw relay, which in turn controls the magnetic clutches 24. The automatic control of the rotation of the drum cam blank, for cutting the drum cam is the same as described incon'nection with cutting the edge and face cams.

Furthermore, while we have shown and described the preferred form of our improved cam cutting machine, it will be understood that we do not wish to be limited to the specific details of construction given, for various modifications and adaptations, may be made in the mechanical arrangement and the relation of parts, without departing from the spirit and scope of the invention.

.said cutter, a profile template mounted for movement in a straight'line radially of said spindle and adapted for cooperation with said tracer, means for rotating said spindle and simultaneously moving said template longitudinally past the tracer, and magnetic clutch operate screw feed means for causing relative movement between the tracer and cutter and the template and cam blank, under the control of said tracer.

2. The cam cutting machine as claimed in claim 1, in which said template is mounted on a rack bar meshing with a gear carried by said spindle, whereby the template is adapted for longitudinal movement corresponding with the rotary movement of the cam blank.

3. The cam cutting machine as claimed in claim 1, in'which said cam blank spindle is adapted to be rotated by magnetic clutches and cut out switches are provided for limiting the'longitudinal movement of said'template in either direction by stopping the rotation of said spindle by the respective magnetic clutches.

4. The cam cuttin machine as claimed in claim 1 in which sai spindle for supporting and rotating the cam blank is mounted in a support carried by a reciprocatin table and said spindle support is adapted to e mounted on said reciprocating table either with the spindle parallel to the axis of the cutter or at right angles thereto.

5. The cam cutting machine as claimed in claim 1, in which said rotating spindle and the associated template are mounted on a reciprocating table adapted for movement by said magnetic clutch operated feed screw under the control of the electric tracer.

6. A machine tool organized for cutting cams comprising a rotatable cutter and an electric tracer, mounted in the same axial plane for cooperation respectively with a cam blank and a profile pattern of the desired cam, means for rotating said cam blank and simultaneously moving said pattern, magnetic clutch operated screw feed means for producing relative toward and from feed movement between the cam blank and the cutter and the pattern and the tracer, said to and from movements being controlled by the tracer in cooperation with said magnetic clutches as thetracer follows the pattern.

7. The machine tool as claimed in claim 6, in which said tracer for controlling said toward and from movement is provided with contacts, operating to make and break a 10W potential circuit through relays controlling a high potential circuit for operating said magnetic clutches.

8. The machine tool as claimed in claim 6, in which the means for rotating said cam blank comprises a magnetic clutch drive, the clutches of which are adapted to operate on the high potential main line circuit and relays adapted to be actuated by a low potential circuit controlled by said tracer are adapted to break the respective circuits of said clutches and stop rotation of the cam blank.

9. The machine tool as claimed in claim 6,

in which motor driven magnetic clutches are provided for rotating said cam blank and simultaneously moving said profile pattern, said clutches being adapted to be energized by the high potential main line circuit, and limit switches placed in circuit with the respective magnetic clutches are adapted to be operated by dogs at the extremes of the pattern to thereby stop rotation of the cam blank after a complete rotation thereof in either direction.

10. The machine tool as claimed in claim 6,

in which magnetic clutches are provided for rotating said cam blank and means is provided whereby said tracer acting through said last named clutches is adapted to control the rotation of said cam blank.

11. A machine tool organized for cutting cams, comprising a rotatable cutter and an electric tracer, mounted in parallel relation in the same vertical plane, a cam blank carrying spindle mounted for. rotation in a horizontal plane passing through the axis of said cutter, a template, carrying a profile of the desired cam, adapted to be moved synchronously with the rotation ofsaid spindle, the profile of said template being adapted to cooperate with said tracer, and means controlled by said tracer for producing relative movement between said cutter and the cam blank for cut ting the cam as the 12. The machine tool as claimed in claim 11, in which means is provided for operatively rotating said cam blank spindle, either parallel with or at right angles to the axis of said cutter for cutting respectively edge and face or barrel cams.

13. The machine tool as claimed in claim 11, in which a slidably mounted rack is geared to said spindle for moving said template, and means is provided for securing the template to said rack, either parallel with or at right angles to the axis of said spindle.

14. The machine tool as claimed in claim 11, in which said spindle is adapted to be rotatedeither parallel with or at right angles to the axis of said cutter-for cutting respectively face and edge cams or barrel cams and a rack bar geared to said spindle is provided with means for holding said template in a vertical plane at right angles to said spindle in the first instance and parallel therewith in the second instance.

JOHN C. SHAW. ROBERT D. SHAW.

tracer follows the profile. 

